Help Setting Up Osmdroid Library For Displaying Opensourcemaps

Hey. I am having trouble setting up the OSMdroid library to display OpenSourceMaps. I am working on an activity that will allow the user to see a map of their current location wit

Solution 1:

I managed to get osmdroid working in a project, but had to have the Google and the OSM views in different activities as if you switch a Mapview from Google to OSM and then try to go back to Google, I got a runtime error saying something like "only one mapview allowed per activity". This results in a lot of duplicate code but it does run OK.

Use the latest osmdroid-android-3.0.3.jar, it's much simpler for drawing overlays. You'll also need to include slf4j-android-1.5.8.jar. For what it's worth here is the code for the lashed up demo that used to start with. It's got a location listener and draws a very simple overlay (line across the screen) If you are familiar with Google Maps, you should be able to adapt it for your purpose.

package osmdemo.demo;

import java.util.List;

import org.osmdroid.tileprovider.tilesource.TileSourceFactory;
import org.osmdroid.util.GeoPoint;
import org.osmdroid.views.MapController;
import org.osmdroid.views.MapView;
import org.osmdroid.views.MapView.Projection;
import org.osmdroid.views.overlay.Overlay;
import org.osmdroid.views.util.constants.MapViewConstants;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Paint.Style;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;

publicclassDemoMapextendsActivityimplementsLocationListener,
        MapViewConstants {

    private MapView mapView;
    private MapController mapController;
    privateMapOverlaymmapOverlay=null;
    private LocationManager mLocMgr;

    /** Called when the activity is first created. */@OverridepublicvoidonCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.copymain);

        mapView = (MapView) this.findViewById(R.id.mapview);
        mapView.setTileSource(TileSourceFactory.MAPNIK);
        mapView.setBuiltInZoomControls(true);
        mapView.setMultiTouchControls(true);

        mapController = this.mapView.getController();
        mapController.setZoom(15);
        GeoPointpoint2=newGeoPoint(53554070, -2959520);
        mapController.setCenter(point2);
        mLocMgr = (LocationManager) getSystemService(LOCATION_SERVICE);
        mLocMgr.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 100,
                this);
        this.mmapOverlay = newMapOverlay(this);
        List<Overlay> listOfOverlays = mapView.getOverlays();
        listOfOverlays.add(mmapOverlay);
        mapView.invalidate();
    }

    publicvoidonLocationChanged(Location location) {

        intlat= (int) (location.getLatitude() * 1E6);
        intlng= (int) (location.getLongitude() * 1E6);
        GeoPointgpt=newGeoPoint(lat, lng);
        mapController.setCenter(gpt);
        mapView.invalidate();
    }

    publicclassMapOverlayextendsorg.osmdroid.views.overlay.Overlay {

        publicMapOverlay(Context ctx) {
            super(ctx);
            // TODO Auto-generated constructor stub
        }

        @Overrideprotectedvoiddraw(Canvas pC, MapView pOsmv, boolean shadow) {
            if (shadow)
                return;

            Paint lp3;
            lp3 = newPaint();
            lp3.setColor(Color.RED);
            lp3.setAntiAlias(true);
            lp3.setStyle(Style.STROKE);
            lp3.setStrokeWidth(1);
            lp3.setTextAlign(Paint.Align.LEFT);
            lp3.setTextSize(12);
            finalRectviewportRect=newRect();
            finalProjectionprojection= pOsmv.getProjection();
            viewportRect.set(projection.getScreenRect());
            // Draw a line from one corner to the other
            pC.drawLine(viewportRect.left, viewportRect.top,
                    viewportRect.right, viewportRect.bottom, lp3);
        }

    }

    @OverridepublicvoidonProviderDisabled(String arg0) {}

    @OverridepublicvoidonProviderEnabled(String provider) {}

    @OverridepublicvoidonStatusChanged(String provider, int status, Bundle extras) {}

}

And the xml (copymain.xml)

<?xml version="1.0" encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"
    ><org.osmdroid.views.MapViewxmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"android:id="@+id/mapview"
        ></org.osmdroid.views.MapView></LinearLayout>